create or replace package test is

  function foo(v_bar in number) return number;

  procedure foo(v_bar in number, v_foobar out number);

end test;
/
create or replace package body test is

  function foo(v_bar in number) return number is
  begin
    return v_bar + 1;
  end foo;

  procedure foo(v_bar in number, v_foobar out number) is
  begin
    v_foobar := foo(v_bar);
  end foo;
	
end test;
/